Mattress



FIG. 1 is a front, top perspective view of a the mattress showing the design;

FIG. 2 is a front view thereof, the rear view being a mirror image thereof;

FIG. 3 is a left side view thereof, the right side being a mirror image thereof;

FIG. 4 is a perspective view showing the mattress in an alternate environment on a bed frame;

FIG. 5 is a perspective view showing the mattress in a second alternate environment and in an articulated position; and,

FIG. 6 is an enlarged and more detailed view of the mattress design illustrating the three line and two stripe design.

The surface shading indicates a contrast in appearance. 

CLAIM The ornamental design for a mattress, as shown and described. 